From: Andy Gross <andy.gross-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
To: Sricharan R <sricharan-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
Cc: Varadarajan Narayanan
<varada-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>,
broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
mark.rutland-5wv7dgnIgG8@public.gmane.org,
david.brown-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org,
linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-arm-msm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-soc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH 10/18] spi: qup: Fix DMA mode interrupt handling
Date: Wed, 14 Jun 2017 16:06:08 -0400 [thread overview]
Message-ID: <20170614200608.GE32733@hector.wework.com> (raw)
In-Reply-To: <66ba7dfb-6ff3-884e-6db0-8d5191f87c93-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
On Wed, Jun 14, 2017 at 12:51:11PM +0530, Sricharan R wrote:
> Hi Varada,
>
> On 6/14/2017 11:22 AM, Varadarajan Narayanan wrote:
> > This is needed for v1, where the i/o completion is not
> > handled in the dma driver.
> >
> > Signed-off-by: Andy Gross <andy.gross-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
> > Signed-off-by: Varadarajan Narayanan <varada-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
> > ---
> > drivers/spi/spi-qup.c | 15 +++++++++++++--
> > 1 file changed, 13 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/spi/spi-qup.c b/drivers/spi/spi-qup.c
> > index 872de28..bd53e82 100644
> > --- a/drivers/spi/spi-qup.c
> > +++ b/drivers/spi/spi-qup.c
> > @@ -510,9 +510,9 @@ static irqreturn_t spi_qup_qup_irq(int irq, void *dev_id)
> >
> > writel_relaxed(qup_err, controller->base + QUP_ERROR_FLAGS);
> > writel_relaxed(spi_err, controller->base + SPI_ERROR_FLAGS);
> > - writel_relaxed(opflags, controller->base + QUP_OPERATIONAL);
> >
> > if (!xfer) {
> > + writel_relaxed(opflags, controller->base + QUP_OPERATIONAL);
>
> This does look correct to remove acknowledging the QUP in normal case and
> do it conditionally only when xfer = NULL.
This is to probably mask the issue of getting erroneous/spurious IRQs.
>
> > dev_err_ratelimited(controller->dev, "unexpected irq %08x %08x %08x\n",
> > qup_err, spi_err, opflags);
> > return IRQ_HANDLED;
> > @@ -540,7 +540,15 @@ static irqreturn_t spi_qup_qup_irq(int irq, void *dev_id)
> > error = -EIO;
> > }
> >
> > - if (!spi_qup_is_dma_xfer(controller->mode)) {
> > + if (spi_qup_is_dma_xfer(controller->mode)) {
> > + writel_relaxed(opflags, controller->base + QUP_OPERATIONAL);
> > + if (opflags & QUP_OP_IN_SERVICE_FLAG &&
> > + opflags & QUP_OP_MAX_INPUT_DONE_FLAG)
> > + complete(&controller->rxc);
> > + if (opflags & QUP_OP_OUT_SERVICE_FLAG &&
> > + opflags & QUP_OP_MAX_OUTPUT_DONE_FLAG)
> > + complete(&controller->txc);
> > + } else {
>
> Is this because in patch #8 that we do not populate the dma callback
> for v1. If that is done, this should not be required at all, as the
> complete would be signalled from the dma callback.
I believe that is true. There shouldn't be any IRQs for DMA enabled
transactions (at least BAM-dma).
--
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next prev parent reply other threads:[~2017-06-14 20:06 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-14 5:52 [PATCH 00/18] spi: qup: Fixes and add support for >64k transfers Varadarajan Narayanan
2017-06-14 5:52 ` [PATCH 01/18] spi: qup: Enable chip select support Varadarajan Narayanan
2017-06-14 9:47 ` Stanimir Varbanov
2017-08-08 11:18 ` Applied "spi: qup: Enable chip select support" to the spi tree Mark Brown
[not found] ` <1497419551-21834-1-git-send-email-varada-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2017-06-14 5:52 ` [PATCH 02/18] spi: qup: Setup DMA mode correctly Varadarajan Narayanan
2017-08-08 11:18 ` Applied "spi: qup: Setup DMA mode correctly" to the spi tree Mark Brown
2017-06-14 5:52 ` [PATCH 06/18] spi: qup: Fix error handling in spi_qup_prep_sg Varadarajan Narayanan
2017-06-14 5:52 ` [PATCH 03/18] spi: qup: Add completion timeout for dma mode Varadarajan Narayanan
2017-06-14 5:52 ` [PATCH 04/18] spi: qup: Add completion timeout for fifo/block mode Varadarajan Narayanan
2017-06-14 5:52 ` [PATCH 05/18] spi: qup: Place the QUP in run mode before DMA transactions Varadarajan Narayanan
2017-06-14 5:52 ` [PATCH 07/18] spi: qup: Fix transaction done signaling Varadarajan Narayanan
2017-06-14 7:13 ` Sricharan R
[not found] ` <4b81a4c7-b85c-a35d-15fb-4aaaec3c7e8c-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2017-06-14 19:51 ` Andy Gross
[not found] ` <20170614195155.GB32733-5taXn+FmohyKb9UB7mSz9QC/G2K4zDHf@public.gmane.org>
2017-06-15 5:14 ` Sricharan R
2017-06-14 5:52 ` [PATCH 08/18] spi: qup: Handle v1 dma completion differently Varadarajan Narayanan
[not found] ` <1497419551-21834-9-git-send-email-varada-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2017-06-14 7:15 ` Sricharan R
[not found] ` <a0e499a7-8f89-96d6-9463-c2b3f774cd6d-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2017-06-14 19:53 ` Andy Gross
2017-06-14 5:52 ` [PATCH 09/18] spi: qup: Do block sized read/write in block mode Varadarajan Narayanan
2017-06-14 5:52 ` [PATCH 10/18] spi: qup: Fix DMA mode interrupt handling Varadarajan Narayanan
2017-06-14 7:21 ` Sricharan R
[not found] ` <66ba7dfb-6ff3-884e-6db0-8d5191f87c93-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2017-06-14 20:06 ` Andy Gross [this message]
2017-06-15 5:52 ` Sricharan R
2017-06-14 5:52 ` [PATCH 11/18] spi: qup: properly detect extra interrupts Varadarajan Narayanan
[not found] ` <1497419551-21834-12-git-send-email-varada-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2017-06-14 7:27 ` Sricharan R
2017-06-14 19:59 ` Andy Gross
[not found] ` <20170614195953.GD32733-5taXn+FmohyKb9UB7mSz9QC/G2K4zDHf@public.gmane.org>
2017-06-14 21:51 ` Matthew McClintock
2017-06-15 5:27 ` Sricharan R
2017-06-14 5:52 ` [PATCH 12/18] spi: qup: refactor spi_qup_io_config into two functions Varadarajan Narayanan
2017-06-14 5:52 ` [PATCH 13/18] spi: qup: call io_config in mode specific function Varadarajan Narayanan
2017-06-14 5:52 ` [PATCH 14/18] spi: qup: allow block mode to generate multiple transactions Varadarajan Narayanan
2017-06-14 5:52 ` [PATCH 15/18] spi: qup: refactor spi_qup_prep_sg Varadarajan Narayanan
2017-06-14 5:52 ` [PATCH 16/18] spi: qup: allow multiple DMA transactions per spi xfer Varadarajan Narayanan
2017-06-14 5:52 ` [PATCH 17/18] spi: qup: Ensure done detection Varadarajan Narayanan
2017-06-14 5:52 ` [PATCH 18/18] spi: qup: support for qup v1 dma Varadarajan Narayanan
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